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# What Is an Isosceles Triangle?

**An isosceles triangle is a specific type of triangle where only two of the side lengths and two of the internal angles are equal.** There are also other types of triangles like equilateral triangles and scalene triangles.

A triangle is a basic polygon shape with three sides. The sides must all be straight and form a closed loop. The internal angles of a triangle always add up to 180 degrees.

It is possible for all three sides of a triangle to be the same length. If they are, the angles will also be the same, with a size of 60 degrees. This is a special type of triangle called an equilateral triangle.

In addition to isosceles and equilateral triangles, there are also triangles where none of the sides or angles are the same size. These are called scalene triangles.

Triangles can also be classified according to the size of their angles. An acute triangle is one where all angles are less than 90 degrees. If a triangle has one angle that is exactly 90 degrees, it is called a right triangle, named after the right angle it contains. Finally, if a triangle has an angle over 90 degrees, it is classified as an obtuse triangle.

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## How Do You Use a Formula for Angles in a Triangle?

A: Three laws can be used to find the sides and angles of almost any triangle: the Law of Angles, the Law of Sines, and the Law of Cosines. The Law of Angles ... Full Answer >Filed Under: -
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## Does a Triangle Have Parallel Sides ?

A: A triangle can never have any parallel lines because there must be three angles that add up to 180 degrees, which makes it impossible for the three sides t... Full Answer >Filed Under: -
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## What Are Some Geometry Formulas for Triangles?

A: A triangle is a three-sided polygon where the sum of its interior angles equals 180 degrees. Some common formulas for triangles include perimeter, the tota... Full Answer >Filed Under: -
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## How Many Angles Does a Triangle Have?

A: Every triangle has three angles, and the sum of those angles is always 180 degrees. This is true whether the triangle is an equilateral, isosceles, scalene... Full Answer >Filed Under: